Apparatus for molding cores



March 21, 1626.

E. C. MOORHEAD APPARATUS. FOR MOLDING CORES 3 Sheets-Sheet 1 illElm/Esra BY fir/r r INVENTOAR Mb 01646.40

1,664,260 E. C. MOORHEAD v APPARATUS FOR MOLDING CORES Filed Jan. 13.1927 3 Sheets-Shget 2 ERMESFC IVOORI'IEAD March 27, .1928.

tfi a Patented Mar. .27, 1928.

essee.

ERNEST C. MOORH'EAD, OF STAMFORD, CONNECTICUT.

APPARATUS FOR MOLDING CORES.

Application filed January 13, 1927.

The invention relatesto the art of proand more particularly has to dowith the production of cores for use in casting metal elements such assash weights and metal units of equivalent physical form. Metal elementsof the class referred to are provided with means for the accommodationof a suspending connection or its equivalent, andin the case of sashweights, are in many instances required to include a designationindicating the weight thereof. For these reasons cores of special formhave been required which, up to the present time, have been individuallybuilt up at a relatively great expense of time and labor. The object ofthe present invention is to provide a novel apparatus whereby the coresreferred to may be produced in large quantities in an efficient anduniform manner and'with a minimum of physical effort. Other objects willappear from the description hereinafter and the features of noveltywillbe pointed out in the claims.

In the accompanying drawings, the invention is illustrated in a formadapted specially for the production of cores for use in casting sashweights, it being understood that this is not to define the limits ofsaid invention. In said drawings Fig. 1 is. an

' elevation of the complete sash weight cast in accordance with thenovel apparatus; Fig. 2

is a View looking at right angles to Fig. 1 showing the core still inconnection with the weight; Fig. 3 is a fragmentary view lookingat'right angles to Fig. 1; Fig. 4 is a sectional view of the coreitself, on' the line le-4 of Fig. 3; Fig.5 is a plan view of the majorcorev box showing it in use; Fig. 6 is a sectional view on the line 66of Fig. 5 Fig. 7 is a plan view showing a guide frame and scraper whichform part of the apparatus; Fig. 8 is a sectional view on the line 88 ofFig. 7; Fig. 9 is a fragmentary section on the line 9-9 of Fig. 8; Fig.10 is a plan view showing the minor core box; Fig. 11 is a sectionalview on the line 11 -11 of Fig. 10; Fig. 12 is a sectional viewillustrating the major and minor core boxes in combination with eachother for the'production of the cores; Figs. 13 and 14 are per- 7spective views of the majorand minor cores respectively, and Fig. 15 isa similar view offthe finished core;

For the purpose of clearness and because Serial No. 160,838.

it is particularly adapted therefor, the invention is described inconnection with the production of sash weights, it being understood,however, that the novel apparatus may be used, with equal efliciency, inother branches of the casting art.

As shown in the drawingsthe apparatus includes a major core boxconsisting of a main plate 20 of metal or other heat resistant materialof suitable shape and dimensions and provided with a plurality of mainmolding chambers 21 extei1ding transversely through said plate as shownin Fig. -6. The chambers 21 are shaped, inaccordance with the form ofcore to be produced and in the illustrated example are provided withcurved walls a and with converging walls 5; the chambers 21 arearrangedin groups over the surface area of the plate 20 and in one.direction at least are located in alignment with each other in rows asshown in Fig. 5. In the direction in which they align with each otherthe chambers 21 of a given row are connected by meansof upwardly openchannels 22- of predetermined surface form as indicatedin Fig. 6; thearrange ment is such that the channels 22 in any given row are inregistry with each other and form a continuous channel interrupted atintervals by the chambers 21 as illustrated in Fig. 5. At opposite edgesthe plate 20 is providedwith projections 23 extending outwardlyandpreferably provided with apertured bushings 24. a i

The apparatus further includes a guide frame 25 shaped and dimensionedtofit upon the plate 20 in'surface engagement there with as shown in Figs.7, Sand 9. The guide frame 25 is provided with parallel slots 26 of awidth corresponding to the width of the channels 22 and of sufficientlength to projec't beyond the terminal channels when the frame 25 is-inplace upon the plate 20; the slots 26 are positioned upon the guideframe 25 so as to register accurately with the channels'22 for thepurpose to be-more fully e:-:-' plained hereinafter. In: order. thatthe. 'uide frame25 may be easily combined witn the plate 20 in theintended manner and maintained in proper position thereon, the frame 25is provided with outwardly "projecting lugs 27 carrying positioning pins28 ar ranged to extend with thebushings 24 ofthe plate 20 as illustratedin Fig. 6-. For usein combination with theguide frame 25 in a manner tobe more fully described hereinafter, a. scraper 29 is provided, andincludes teeth or scraping members 30 located, dimensioned and shaped tofitthe slots 26 and the channels 21 in the manner illustrated in Fig. 8.

In addition to the parts so far described, the apparatus includes aminor core box consisting of an auxiliary plate 31 of metal or otherheat resistant material dimensioned and shaped to fit in surfaceengagement with the main plate 20 as shown in Fig. 12. The auxiliaryplate 31 is provided with second ary molding chambers shaped in apredetermined manner to properly co-operate with the main chambers 21and located so as to register therewith when the two plates arecombined. The auxiliary plate 31 includes outwardly projecting ears 33and positioning pins 34 extending perpendicularly therefrom forinsertion into the'bushings 24 to properly'position theplates withrespect to each other and to maintain them in such position.

If the sash weight or other casting, in its finished form, is intendedto include a figure designating the weight of the casting or adesignation indicating some other character istic, a base plate 35 ofsuitable form and dimensions may form part of the apparatus. Upon itsupper surface the base plate 35, in such case, is provided withmoldingor impression devices 36 of a character to produce the desired figuresor other designations in the finished casting. The devices 36 may bedirectly produced on the base plate 35 as in tegral parts thereof, orattached inv place thereon as independent elements; in any case thedevices 36 are located'so as to register with the secondary chambers 32of the auxiliary plate 31 as shown in Fig. 10. To properly position andfix the plate 31 on the base plate 35, the latter may be provided withrecesses 37 for the reception of the positioning pins 34. 7

In the production of cores for use in casting sash weights, such asillustrated in Fig. 1, it is customary to utilize a mixture of sand andlinseed oil or other suitable binder, as the material for the cores, andto subject the molded cores to the action of heat to produce units ofsufficient stability and cohesion to permit handling and yet capable ofbeing easily crumbled to pieces when the casting operation has beenfinished. I

hen utilizing the apparatus illustrated and described. hereinforinolding such cores, the main molding chambers 21 of the main plate20 are filled with the core material 0, the filling operation beingperformed in any convenient manner. In the preferred method, the mainplate 20 is placed upon a supply of the-core material and is manipulatedback and forth in said supply to cause the plate to embed itselfin thematerial and to cause the latter to work its way upwardly into thechambers 21; this operation is continued until the latter, and perhapseven the channels 22, are filled with the material 0, for instance,asshown in Fig. 6.

At this stage the guide frame 25 is placed in position upon the filledmain core box with the pins 28 extending into the bushings 24; in thiscondition of the apparatus the slots 26 are in registry With thechannels 22 and project beyond the main plate 20 at opposite ends asshown in Fig. 7. The scraper 29 is then placed in position upon theguide frame 25 with the scraping members 30 extending into theprojecting portions of the slots 26; the scraper 29 is so proportionedthat when it rests edgewise upon the plate 20, the members 3O' willextend through the slots 26 into accurate registry with the channels 22which they are dimensioned to fit as shown in Fig. .8. The scraper 29 isthen moved along the guide frame 25 in the direction of the length ofthe slots 26 andthereby scrapes. the core material 0 from the channels22 and correspondingly scrapes such material from the main cores 0? inthe chambers 21 to-form upwardly open channels 6. in said cores asindicated in Figs. 7, 8 and 9. This scraping operation and the operationof filling the molding chambers 21 has packed the material 0 therein toan extent sufiicient to fix the main cores cl in said chambers againstunintentional dropping therefrom; the character of the core materialassists in the development of the slight surface adhesion and thecohesion necessary to maintain the main cores d in the chambers 21.

Either at this time or previously the secondary molding chambers 32 ofthe auxiliary core plate 31 have been filled with core material andplaced upon the base plate 35 in order that impression f from thedevices 36 may be made simultaneously in all of the auxiliary cores 9 asshown in Figs. 10 and 11. Any suitable method may be used to level offthe upper end surfaces of the auxiliary cores 9 and to fix the latteragainst unintentional dropping from the chambers 32; it'Will beunderstood that the physical characteristics of the core materialwillhere also assist in the development of the surface adhesion and thecohesion necessary to prevent unintentional dropping of the auxiliarycores 9 fromthe plate 31. At this stage a multiplicity of main cores dwith transverse upwardly open channels 6 are located in. the main coreplate 20, and a correspondingnumberof auxiliary cores g with theimpressions f'upon one surface thereof are located in the auxiliary coreplate 31. The latter with its plurality of auxiliary cores 9 is nowlifted from the base plate 35 and brought into surface engagement withthe main core plate 20, the pins 34 being inserted into the bushings 24:to properly lomeager) cate the plate '31 upon the plate 20 and tomaintain it in place thereon. In this condition the auxiliary cores 9are positioned over and in engagement with the main cores cl with theimpressions f in registry with and facing the channels a of said maincores as illustrated in Fig. 12. The combined plates 20 and 31 are thenplaced in an oven or equivalent device in order to subject the cores toa heat action sufficient to bake the main and auxiliary cores and tounite them in the form of a unit as shown in Fig. 15. After the bakingprocess has been completed the finished cores are removed from theplates in any convenient manner and utilized in the conventional mannerin the casting process. It will be noted that in the casting operationthe channels e of the cores produce cross bars h in the finished weight71 and that the solid ends j of said cores produce eyelets k, theimpression f meanwhile producing a corresponding figure or otherdesignation Z upon the end surfaces of the weights 71. Because of thetapering form of the core, a corresponding taper is given to the weight71 as indicated at m. It will of course be understood that the characterof the core will always be in accordance with the character of thecasting which is to be made. In any case, however, the operation ofproducing cores of the indicated class is reduced to the utmostsimplicity and large numbers of cores may be coincidentally produced ina uniform and economical manner and without the need for any speciallyskilled operators. After the casting of the weights or other elementshas been completed, the combined cores d-g may simply be crumbled up andthereby removed from the casting.

Various changes in the specific form shown and described may be madewithin the scope of the claims without departing from the spirit of theinvention.

I claim:

1. In an apparatus for molding cores, a majorcore box provided with aplurality of main molding chambers located in a row, and having'channelsextending between said chambers in alignment with each other.

2. In an apparatus for molding cores, a major core box provided with aplurality of main molding chambers located in a row, and having channelsextending between said chambers in alignment with each other, and aminor core box provided with a plurality of secondary molding chambers,said main and secondary chambers being arranged to independently moldmain and auxiliary cores and being adapted to register with each otherto combine said main and auxiliary cores.

3. In an apparatus for molding cores, the combination of a main coreplate provided with a plurality of molding chambers arranged in parallelrows, and having upwardly open channels extending between the chambersin each row in alignment with each other, a guide frame adapted to fitupon said main core plate and having a plurality of slots located forregistry with said channels, and a scraping device movable lengthwise ofsaid slots and fitting into said channels and movable diametricallyacross said chambers to form upwardly open channels in the main corestherein.

4. In an apparatus for molding cores, the combination of an auxiliarycore plate provided with a plurality of secondary molding chambers, abase plate arranged for surface engagement with said auxiliary coreplate, and impression devices on said base plate arranged to registerwith said molding chambers.

5. In an apparatus for molding cores,the combination of a main coreplate provided with a plurality of molding chambers arranged in parallelrows, and having upwardly open channels extending between the chambersin each row in alignment with each other, an auxiliary core plateprovided with a plurality of secondary molding chambers and arranged tofit in surface engagement with said main plate, said main and secondarychambers being arranged to independently mold main and auxiliary coresand being adapted to register with each other to combine said main andauxiliary cores, apertured projections on oneof said plates, andpositioning pins on the other plate co-operating with said aperturedprojections to position the plates relatively to each other and tomaintain them in such position.

6. In an apparatus for molding cores, the combination of a main coreplate provided witha plurality of molding chambers arranged in parallelrows, and means movable diametrically across a plurality of saidchambers simultaneously to concurrently groove the core material in saidplurality of chambers.

7. A core box for sash weight cores'having a base forming section, acore loop forming ring section and a core loop forming base, the baseforming section having a series of base forming apertures open at bothends, means adapted to close one end of each opening at the base, thecore-loop forming ring member having core loop forming openings; andaligned openings intersecting the core loop forming openings, providingfor the removal of the sand from the area between the aligned openingsto form the holes in said core loops.

8. A core box for sash weight cores having a base forming section, acore loop forming ring section and a core loop form? ing base, the ba eform ng ect on a g a series of base forming apertures open at bothopenings, and a sweep adapted to enter said ends, a number supporthavlng numbers to aligned openings and remove the sand from registerwith the openings and adapted to the centers of said apertures. 10 closeone end of each opening at the base, In testimony whereof I havehereunto the core loop forming ring member having set my hand. core loopforming openings and aligned openings intersecting the core loop formingERNEST C. MOORHEAD.

